The sliding bearing is a bearing that works under sliding friction, and its sliding bearing works smoothly, reliably, and without noise. Under liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced, and the oil film also has a certain vibration absorbing capability. However, the starting friction resistance is large. The part of the shaft that is supported by the bearing is called the journal, and the part that matches the journal is called the bearing. The layer of friction reducing material cast on its inner surface in order to improve the frictional properties of the surface of the bearing pad is referred to as a bearing lining. The material of the bearing bush and bearing bushing is collectively referred to as a plain bearing material. Sliding bearing applications are generally under high speed and light load conditions.
The sliding bearing absorbs and transmits the force between the moving parts, maintaining the position and positioning requirements of the two parts. In addition, the directional motion is also converted into a rotary motion (such as a reciprocating piston engine).
Sliding friction occurs when the sliding bearing works. The magnitude of the sliding friction depends mainly on the manufacturing precision, and the frictional force of the sliding bearing mainly depends on the material of the sliding surface of the bearing. The sliding bearing generally has a self-lubricating function on the working surface, and the sliding bearing is divided into a non-metallic sliding bearing and a metal sliding bearing according to the material.